New Beetle GLS L4-2.0L (AVH) (2001)
Electronic Throttle Control Module: Testing and Inspection
With Manufacturer's Scan Tool
Throttle Valve Control Module, Checking
Components of throttle valve control module (J338): Throttle valve drive (G186), angle sensor 1 for throttle valve drive (G187) and angle sensor 2 for
throttle valve drive (G188).
NOTE:
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If the throttle valve control module is replaced, the new control module must without fail be adapted to the Engine Control Module (ECM).
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On vehicles fitted with an automatic transmission the transmission control module must also be adapted:
Special tools and equipment
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Scan tool VAG 1551 or vehicle system tester V.A.G 1552 with cable VAG 1551/3B
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Test box V.A.G 1598/31
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Hand multimeter V.A.G 1526 or multimeter VAG 1715
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Adapter set V.A.G 1594
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Wiring diagram
Test conditions
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Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
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Throttle valve not damaged or dirty.
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All electrical consumers, e.g. lights and rear window heating must be switched off.
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If the vehicle is equipped with an air conditioner, this must be switched off.
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The battery voltage must be at least 11.5 V.
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Coolant temperature must be at least 85 °C, see display group 04, display zone 3.
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On vehicles with automatic transmission selector lever in "P" or "N" position
NOTE: Only gold-plated terminals can be used to repair the terminals in the connector for the throttle valve control module.
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Connect scan tool VAG 1551 (V.A.G 1552). Then switch ignition on and select engine control module with "Address word" 01.
Connecting scan tool and selecting engine control module. See: Computers and Control Systems/Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/Scan Tool Connecting
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons 0 and 8 for function "Read Measuring Value Block" and confirm entry with Q button.
Indicated on display
Read Measuring Value Block
Input display group number XXX
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Press buttons 0, 6 and 2 for "Display group number 62" and confirm entry with Q button.
Indicated on display (1-4 = Display zones)
Read Measuring Value Block 62
->
1
2
3
4
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Check throttle valve angle of sensor 1 (G187) on idle speed stop in display zone 1.
Specification: 3 to 16 %
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Check throttle valve angle of sensor 2 (G188) on idle speed stop in display zone 2.
Specification: 97 to 82 %
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Depress accelerator slowly until full throttle position and observe angles displayed in display zones 1 and 2:
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The percent display in display zone 1 must rise continuously and evenly. The full tolerance range 3 to 93 % is not always displayed.
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The percent display in display zone 2 must fall continuously and evenly. The full tolerance range 97 to 3 % is not always displayed.
NOTE:
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The reason why the display in display zone 1 rises and the display in display zone 2 falls is because the potentiometers (angle sensors) in the